[Qt-interest] Library binary compatibility issue

[Thiago Macieira]

Em Sexta-feira 21 Maio 2010, às 14:27:20, Giacomo S. escreveu:
>  I thought that reimplementing a virtual method declaring its
> implementation as non virtual would have removed the virtual
> behaviour...

Once virtual, it's virtual forever. So the "virtual" keyword is optional in 
overriding. 

But if you get the method signature wrong, instead of overriding, it simply 
shadows the original virtual method. This is something that C# got right and 
the original C++ didn't, but C++0x allows for fixing.

That is, when you write a virtual function, you declare whether it's a new 
virtual, or whether you're overriding a virtual. Then the compiler can tell 
you when you think you're declaring a new one but you're actually overriding, 
or when you think you're overriding but you're not.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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